Insta Cash "Law Offices" from Insta Cash told me my friend was a "primary suspect" don't know, Internet

I received a call on April 13th on my cell phone (caller ID just showed "0000") from a "Mark Johnson" from the "Law Offices of Insta Cash" asking for me by name. When I acknowledged who I am, they asked me if I knew a Deborah (blank). The caller had a very thick Indian accent so I could barely understand him and the call quality was extremely poor. It took him several times repeating the name before I could figure out that he was butchering the pronunciation of my best friend's last name. When I acknowledged that I knew her, he said that she'd put me down as reference and they'd been trying to get a hold of her. He then rattled off a phone number for me to give to her. I was laid up from knee surgery and no where near a pen & paper to write the number down and told him so. He kept pushing me to get a pen to write the number down. I asked him what this was regarding, and he said that she was a "primary suspect." I kept asking him primary suspect for what? He finally put someone else on the phone who also tried to get me to write down a phone and kept stating that she was a primary suspect. I kept telling him that the call quality was very poor and that I couldn't understand him. They finally hung up. I knew at the very least these were bottom feeder debt collectors that were violating the Fair Debt Collection Practices Act. The only way that they could have put our two names together (and obtained my cell phone number) was from an online job resume database where she'd listed me as a reference. From my subsequent Internet search, I now know that this is an ongoing scam.